Naoya read a book cover to cover in a single session, at a rate of 55pages per hour. after reading for 4 hours, he had 330 pages left to read.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.